Patent US3670332A successfully refreshed from Google Patents.
US3670332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finding device
Assignee: CHRISTIAAN HUYGENSLABORATORIUM
•
Filing: 1969-09-10
•
Granted: 1972-06-13
•
Expires: 1989-09-10
Abstract
Abstract Direction finding device with a high directivity antenna with a narrow beam, and a pair of interferometer elements with a periodical radiation pattern. The signals obtained from the high directivity antenna and the interferometer elements respectively are compared in such a way, that by means of the comparison results a distinction can be made between signal sources in different sectors of the beam of the high directivity antenna.
Inventors
- 👤 Ronald Blommendaal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:02
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4454; G01S1/00; G01S1/02; G01S13/4409; G01S3/00; G01S3/02; G01S3/04; G01S3/06; G01S3/14; G01S3/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
242 words
Direction finding device comprising a high directivity antenna having a narrow beam whose maximum power lies along a main axis about which the beam is symmetrical, interferometer antenna means mechanically coupled with said antenna for providing a beam of predetermined radiation pattern, hybrid means coupled to said interferometer antenna means for providing output sum and difference signals which are a periodic function of the angle between the direction of the radiation source and the main axis, phase detector means connected to said hybrid means for receiving said sum and difference signals therefrom and for detecting said signals with a coherent signal derived from said antenna, and comparison means for comparing the output of said phase detector with reference signals of predetermined magnitude for deriving an output code of which a first digit has a first value if said signal related to the high directivity antenna is stronger than its related reference signal, and has a second value if this is not the case, while a second digit has a first value if one of the detected further signals is stronger than its related reference signal and has the same polarity, and has a second value if one or both conditions are not met, and a third digit has a first value if another of said further signals is stronger than its related reference signal and has the opposite polarity, and has a second value if one or both conditions are not met.
Claim 2
Dependent Claim
242 words
Direction finding device comprising a high directivity antenna having a narrow beam whose maximum power lies along a main axis about which the beam is symmetrical, interferometer antenna means mechanically coupled with said antenna for providing a beam of predetermined radiation pattern, hybrid means coupled to said interferometer antenna means for providing output sum and difference signals which are a periodic function of the angle between the direction of the radiation source and the main axis, phase detector means connected to said hybrid means for receiving said sum and difference signals therefrom and for detecting said signals with a coherent signal derived from said antenna, and comparison means for comparing the output of said phase detector with reference signals of predetermined magnitude for deriving an output code of which a first digit has a first value if said signal related to the high directivity antenna is stronger than its related reference signal, and has a second value if this is not the case, while a second digit has a first value if one of the detected further signals is stronger than its related reference signal and has the same polarity, and has a second value if one or both conditions are not met, and a third digit has a first value if another of said further signals is stronger than its related reference signal and has the opposite polarity, and has a second value if one or both conditions are not met.
Claim 3
Dependent Claim
36 words
Device according to claim 1, wherein the interferometer antenna means comprise a pair of antennas each providing a signal whose maximum power lies in different directions with respect to the main axis for each said signal.
Claim 4
Dependent Claim
50 words
Device according to claim 2, wherein the hybrid means comprises a magic T and produces from the signAls provided by the interferometer means a sum signal, a maximum of which coincides with the main axis, as well as a difference signal, a null of which coincides with the main axis.
Claim 5
Dependent Claim
22 words
Device according to claim 1, wherein the interferometer antenna means comprise two radiators, one on each side of the high directivity antenna.
Claim 6
Dependent Claim
20 words
Device according to claim 1, wherein the interferometer antenna means comprises a single radiator disposed beside the high directivity antenna.
Claim 7
Dependent Claim
15 words
Device according to claim 1, wherein the high directivity antenna is connected to a transmitter.
References Cited (Backward Citations)
US3406393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |